//
//  UITextView+FilterEmoji.m
//  TWAppNew
//
//  Created by line0 on 13-8-26.
//  Copyright (c) 2013年 makeLaugh. All rights reserved.
//

#import "NSString+FilterEmoji.h"

@implementation NSString (FilterEmoji)

- (BOOL)containsEmoji
{
    __block BOOL returnValue = NO;
    
    [self enumerateSubstringsInRange:NSMakeRange(0, self.length)
                                  options:NSStringEnumerationByComposedCharacterSequences
                               usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop)
     {
         
         const unichar hs = [substring characterAtIndex:0];
         // surrogate pair
         if (0xd800 <= hs && hs <= 0xdbff)
         {
             if (substring.length > 1)
             {
                 const unichar ls = [substring characterAtIndex:1];
                 const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
                 if (0x1d000 <= uc && uc <= 0x1f77f)
                 {
                     returnValue = YES;
                 }
             }
         }
         else if (substring.length > 1)
         {
             const unichar ls = [substring characterAtIndex:1];
             if (ls == 0x20e3)
             {
                 returnValue = YES;
             }
             
         }
         else
         {
             // non surrogate
             if (0x2100 <= hs && hs <= 0x27ff)
             {
                 returnValue = YES;
             }
             else if (0x2B05 <= hs && hs <= 0x2b07)
             {
                 returnValue = YES;
             }
             else if (0x2934 <= hs && hs <= 0x2935)
             {
                 returnValue = YES;
             }
             else if (0x3297 <= hs && hs <= 0x3299)
             {
                 returnValue = YES;
             }
             else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50)
             {
                 returnValue = YES;
             }
         }
     }];
    
    return returnValue;
}

@end
